As saiid great for 3d games, and most modern games/ports support rtg.
ITs awesome for workbench , you wont look back. And more modern software , some paint packages etc will use the higher res and depths
A mediator, though I have never owned one, will bring some other cheap pci upgrades, like sound cards (again hardwarwe hitting games wont use, but more modern one will), tv cards, network cards